GP bomb

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Noun1.GP bomb - a large bomb (500 to 2,000 pounds that is 50% explosive) whose explosion creates a blast and whose metal casing creates some fragmentation effect
blockbuster - a large bomb used to demolish extensive areas (as a city block)
bomb - an explosive device fused to explode under specific conditions
References in periodicals archive ?
Thankfully, after all the emergency responding agencies had been notified and were standing by to respond, the GP bomb was returned to a completely safe state.
In a GP bomb, you put an iron tail kit on the back without any kind of computer on board, as they did in Vietnam and quite a bit in Desert Storm.
I was up for a good-deal, section, low-altitude pop hop with two live 500-pound GP bombs and 250 rounds of 20mm bullets.